.clearfix::before, .clearfix::after {
    content: "";
    display: table;
}

.clearfix::after {
    clear: both;
}

.clearfix {
    *zoom: 1;
}

.fl {
    float: left;
}

.fr {
    float: right;
}

.positionraletive {
    position: relative;
}

.positionabsolute {
    position: absolute;
    left: 0;
    top: 0;
}

html, body {
    width: 100%;
    height: 100%;
}